1.

If `(x+a)`is a factor of `2x^2+2a x+5x+10`, find `a`.

Answer» Correct Answer - a = 2
Let `f(x) = 2x^(2) + 2ax + 5x + 10`. Then , f(-a) = 0.
` :. 2a^(2) - 2a^(2) - 5a+10=0 rArr 5a = 10 rArr a = 2.`


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